Add rustfmt + clippy

.github/workflows/clippy.yml

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+name: Clippy check
+on: push
+
+# Make sure CI fails on all warnings, including Clippy lints
+env:
+  RUSTFLAGS: '-Dwarnings'
+
+jobs:
+  clippy_check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Run Clippy
+        run: cargo clippy --all-targets --all-features

.github/workflows/codecov.yml

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+name: Code coverage
+on: [push]
+
+jobs:
+  test:
+    name: coverage
+    runs-on: ubuntu-latest
+    container:
+      image: xd009642/tarpaulin:develop-nightly
+      options: --security-opt seccomp=unconfined
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Generate pith code coverage
+        run: |
+          cargo +nightly tarpaulin --verbose --all-features --workspace --timeout 120 --out xml
+
+      - name: Upload to codecov.io
+        uses: codecov/codecov-action@v3
+        with:
+          token: ${{secrets.CODECOV_TOKEN}}
+          fail_ci_if_error: true

.github/workflows/rust_fmt.yml

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+name: Rustfmt
+on: pull_request
+
+jobs:
+  format:
+    runs-on: ubuntu-latest
+    permissions:
+      pull-requests: write
+      contents: read
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@nightly
+        with:
+          components: rustfmt
+      - uses: mbrobbel/rustfmt-check@master
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          mode: review

.github/workflows/test.yml

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+name: test
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Build
+        run: cargo build-bpf
+      - name: Run tests
+        run: cargo test --verbose